23 February 2011 Encoding terahertz signatures into laser-induced plasma acoustic waves
Author Affiliations +
Proceedings Volume 7938, Terahertz Technology and Applications IV; 793804 (2011) https://doi.org/10.1117/12.877071
Event: SPIE OPTO, 2011, San Francisco, California, United States
Abstract
The enhancement of acoustic waves from a laser-induced plasma, from audible into the ultrasonic range, is a linear function of the terahertz (THz) intensity incident on the plasma, making THz-enhanced acoustics (TEA) useful for THz detection at a standoff distance. When a femtosecond laser of sufficient peak energy is focused into air, the gas is ionized and acoustic waves are launched through the photoacoustic process. THz field-induced energy transfer through acceleration of free electrons, and the following electron-molecule collisions, results in an enhanced acoustic emission from the plasma. A physical understanding of free electron manipulation inside a dual-color laser filament is used to encode THz spectroscopic information into acoustic waves, making it possible to coherently detect the electric field profile of the THz pulse by simply "listening" to the plasma from a distance. Our most recent results utilizing TEA as method for remote THz detection will be presented.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Benjamin Clough, Jingle Liu, X.-C. Zhang, "Encoding terahertz signatures into laser-induced plasma acoustic waves", Proc. SPIE 7938, Terahertz Technology and Applications IV, 793804 (23 February 2011); doi: 10.1117/12.877071; https://doi.org/10.1117/12.877071
PROCEEDINGS
7 PAGES


SHARE
Back to Top